class person:
    _phone: str = None
    _salary: float = None

    def __init__(self, phone: str, salary: float):
        self._phone = phone
        self._salary = salary

    def __str__(self):
        return f"Phone: {self._phone}, Salary: {self._salary}"

    def call_phone(self):
         print("父类拨打电话")
